Researchers: Major Ad Networks Serving Malware

Researchers at web security firm Armorize Technologies recently discovered that DoubleClick and Microsoft ad networks were serving (for a brief time) a banner ad tainted with malware. The attack could had of impacted millions, the researchers day.

Researchers at web security firm Armorize Technologies recently discovered that DoubleClick and Microsoft ad networks were serving (for a brief time) a banner ad tainted with malware. The attack could had of impacted millions, the researchers day.Armorize chief technology officer Wayne Huang revealed in this blog post that two of the world's largest ad networks were actively serving malware and potentially infecting visitors to Web sites serving those ads. Millions of web users could had of been infected, Armorize CEO Caleb Sima told InformationWeek in an interview.

The payload in the attacks is a malicious program known as HDD Plus, which is a bogus system analysis and optimization program.

Armorize discovered the attacks on December 4 through its HackAlert offering. HackAlert is designed to identify Web sites and online advertisements infected with malware. The malware was served through JavaScript code transferred through online ads from DoubleClick, Sima said.

Behavior: Users visit websites that incorporate banner ads from DoubleClick or rad.msn.com, the malicious javascript is served from ADShufffle.com (notice the three f's), starts a drive-by download process and if successful, HDD Plus and other malware are installed into the victim's machine, without having the need to trick the victim into doing anything or clicking on anything. Simply visiting the page infects the visitors.

Known sites affected: Sites that incorporate DoubleClick or rad.msn.com banners, including for example Scout.com (using DoubleClick), realestate.msn.com, msnbc.com (using both), and mail.live.com. We'd like to note here it's very possible that multiple exchanges, besides those listed here, have been serving the fake ADShufffle's ads.

Notice the three Fs in the name ADShufffle, it's a deft fake of the legitimate AdShuffle.

Malware installed:
Over the past week, ADShufffle kept on changing the malware. Besides HDD Plus, other types of malware, such as backdoors, have been served. Later in the article we will provide links to our observed binaries.

Exploit packs used:
Primarily a modified version of Eleonore. Neosploit was also used. With neosploit, malicious binaries are obfuscated on-the-fly before being served.

Not a trivial attack. And users who visited web sites serving the attack advertising were hit with the payload without having to click on anything; large web sites such as MSBC were affected; the exploits were well obfuscated; and according to Armorize, anti-virus vendors were very poor in initial detection rates.

Because these ads have the potential to be served to millions of web browsers, it's nearly impossible to determine how many people could have been infected. One thing that can be determined with more certainty: expect more of these kinds of attacks.

Such ad networks and other shared services, like web application widgets, have the potential to quickly hit millions of users. My bet is that it is only a matter of time before we see many more similar incidents.

While there's never any good news in such breaches, it's promising DoubleClick, Microsoft, and AdShuffle (the legitimate one) were able to quickly clamp down on the attack.

For my security and technology observations throughout the day, find me on Twitter.

Published: 2015-03-03Off-by-one error in the ecryptfs_decode_from_filename function in fs/ecryptfs/crypto.c in the eCryptfs subsystem in the Linux kernel before 3.18.2 allows local users to cause a denial of service (buffer overflow and system crash) or possibly gain privileges via a crafted filename.

Published: 2015-03-03** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue in customer-controlled software. Notes: none.

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